chore: fix lowercase header

Author: kollegian

pages/dev-advanced-concepts/_meta.json

@@ -7,7 +7,7 @@
   "execute-multiple": "Execute Multiple Transactions",
   "hd-path-coin-types": "HD Path & Coin Types",
   "proposals": "Proposals",
-  "ibc-relayer": "Ibc Relayer",
+  "ibc-relayer": "IBC Relayer",
   "evm-rpc-endpoints": "EVM RPC Endpoints",
   "interoperability": "Interoperability",
   "differences-with-ethereum": "Differences from Ethereum"